Improvement in trip-hammers



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N.PErERS, PHOTO LTHOGRAPHER ASI-micron D c UNITED STATES PATENT' OFFICE.

JOHN Raices, or LOUISVILLE, KENTUCKY.

IMPROVEMENT IN TRIP-HAMMERS.

Specification forming part of Leiters Patent No. 40,390, dated October 27, 1863; antedated October 11, 1833.

To all whom it may concern.-

Be it known that I, JOHN BRIGGs, of Louisville, in the county of Jefferson and State of Kentucky, have invented a new and-useful Improvement in Trip-Hammers; and I do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in Which- Figure l is a side elevation of a trip-hammer, illustrating my invention. Fig. 2 is atop view of the same. Fig. 3 is a transverse section of the same at .fr x.

Similar letters of reference indicate corresponding parts in the several views.

The subject of my invention is a trip-hammer adjustable inthe height of its stroke; and the invention particularly consists, first, in an adjustable device affording a horizontal bearing for elevating the hammer in a vertical plane to any height without lateral pressure; second, in an improved construction and arrangement of cam-wheels, which serve also as iiy-wheels. A

In order that others skilled in the art to which my invention appertains may be enabled to fully understand and use the same, I will proceed to describe its construction and operation.

A represents a bed-plate, from which rise standards B B C C, in the former of which the hammer-shaft D is fulcrumed.

E is a shaft journaled transversely beneath the hammer-shaft in bearings o n the standards C C, and rotated by a pulley or wheel, F, or other suitable means. 4

G G are a pair of iiy-wheels, secured upon the shaft near its center with a sufficient interval between them to receive and permit the play of the hammer-shaft D.

H H are a pair of wedges or inclined planes, attached by their bases to a disk, H', adapted to slide upon the shaft E. The said Wedges Work freely in slots g in the wheels G.

I I are boxes -tted to slide radially out and in on the slots g and pressed inward against the wedges H by springs J J.

K K are rollers journaled in the boxes I I. The boxes I are formed with elongations t in order to support the general bearings at an equal distance from the center of rotation, While both boxes rest upon the inclined faces of the wedges H.

Dotted lines at d in Fig. l represent an inclined or cam surface on the under side of the hammer-shaft for gradually raising the same to any desired height by the impact o f the rollers K, and afterward permitting it to fall suddenly, as will be hereinafter explained.

d represents an elastic substance applied to the cam d to take off the suddenness of impact of the rollers K. The wedges H may be moved in and out by a lever engaging in the gland h, or by a screw rack and pinion or other suitable means.

L represents a spring, which gradually arrests the -momentum of the hammer on its upward stroke and accelerates its descent. The said spring may be of any suitable form, or

. may be entirely dispensed with.

D represents the hammer-head, .and M the anvil. l

The Operation is as follows: Rotation being imparted to the shaft in the directionshown by the arrow in Fig. l, the rollers K, passing underneath the cam d, raise the hammer D and permit it to fall suddenly on anything upon the anvil M. By moving the wedges H inward the rollers K are forced radially Outward from the center, and the length and force ofthe stroke ofthe hammer thereby increased as may -be necessary.

It will be observed that the parallelism and y horizontality of the rollers are maintained whatever their distance from the shaft. The hammer is therefore raised upward in a vertical plane, and is caused to strike accurately and fairly. An additional and highly important advantage of the rollers K is the great reduction of friction against the cam d.

The whees G serve as y-wheels, and, being placed on each side of and close to the point at' which the power is applied to the hammer-shaft, admit of the use of a lighter driving-shaft than would otherwise be practicable.

Having thus described my invention, what -I claim as new therein, and desire to secure by Letters Patent, is-

l. The employment or use of parallel rollers or bearing K, interposed between the wedges H and hammer-shaft D for raising the latter to variable heights in a directly vertical plane.

2. The wheels G, secured to the shaft E,near the hammershaft D, and serving the combined purposes of cam andliy wheels.

Witnesses: JOHN BRIGGS.

OcrAvrUs KNIGHT, R. H. MAYHEW. 

